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200-901 Practice Question: Which TWO are benefits of using VLANs in a…
Which TWO are benefits of using VLANs in a network? (Choose two.)
⚠ Common exam trap
Cisco often tests the misconception that VLANs reduce collision domains, but collision domains are a Layer 1 concept eliminated by switches, not by VLANs; the correct benefit is reducing broadcast domains.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reducing the size of broadcast domains
VLANs segment a Layer 2 network into isolated broadcast domains. By default, all ports on a switch belong to a single broadcast domain; VLANs restrict broadcast frames (e.g., ARP requests) to only those ports within the same VLAN, reducing unnecessary traffic and improving network performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Reducing the size of broadcast domains
Why this is correct
VLANs segment the network into smaller broadcast domains.
- ✗
Simplifying Layer 3 routing
Why it's wrong here
Routing between VLANs is required.
- ✓
Improving network security by isolating traffic
Why this is correct
VLANs can isolate sensitive traffic.
- ✗
Reducing the number of collision domains
Why it's wrong here
Switches create collision domains per port, not VLANs.
- ✗
Guaranteeing faster routing performance
Why it's wrong here
VLANs do not guarantee performance.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.